var region = new Object();
var process_request = "正在处理您的请求...";
region.isAdmin = false;

region.loadRegions = function(parent, type, target)
{
  Ajax.call(region.getFileName(), 'type=' + type + '&target=' + target + "&parent=" + parent , region.response, "GET", "JSON");
};

/* *
 * 载入指定的国家下所有的省份
 *
 * @country integer     国家的编号
 * @selName string      列表框的名称
 */
region.loadProvinces = function(country, selName)
{
  var objName = (typeof selName == "undefined") ? "selProvinces" : selName;

  region.loadRegions(country, 1, objName);
};

/* *
 * 载入指定的省份下所有的城市
 *
 * @province    integer 省份的编号
 * @selName     string  列表框的名称
 */
region.loadCities = function(province, selName)
{
  var objName = (typeof selName == "undefined") ? "selCities" : selName;

  region.loadRegions(province, 2, objName);
};

/* *
 * 载入指定的城市下的区 / 县
 *
 * @city    integer     城市的编号
 * @selName string      列表框的名称
 */
region.loadDistricts = function(city, selName)
{
  var objName = (typeof selName == "undefined") ? "selDistricts" : selName;

  region.loadRegions(city, 3, objName);
};

/* *
 * 处理下拉列表改变的函数
 *
 * @obj     object  下拉列表
 * @type    integer 类型
 * @selName string  目标列表框的名称
 */
region.changed = function(obj, type, selName)
{
  var parent = obj.options[obj.selectedIndex].value;

  region.loadRegions(parent, type, selName);
};

region.response = function(result, text_result)
{
  var sel = document.getElementById(result.target);

  sel.length = 1;
  sel.selectedIndex = 0;
  if (result.regions&&result.regions.length>0){
	  sel.style.display = '';
  }
  if (document.all)
  {
	sel.fireEvent("onchange");
  }
  else
  {
	var evt = document.createEvent("HTMLEvents");
	evt.initEvent('change', true, true);
	sel.dispatchEvent(evt);
  }

  if (result.regions)
  {
	for (i = 0; i < result.regions.length; i ++ )
	{
	  var opt = document.createElement("OPTION");
	  opt.value = result.regions[i].region_id;
	  opt.text  = result.regions[i].region_name;

	  sel.options.add(opt);
	}
  }
};

region.getFileName = function()
{   
	var pathName = window.location.pathname.substring(1); 
	var webName = pathName == '' ? '' : pathName.substring(0, pathName.indexOf('/')); 
	var root= window.location.protocol + '\/\/' + window.location.host + '/'+ webName + '/'; 
	return root+"home/mandou/src/httpdata/region.php"; 
};
